The first four characters (ANDB) represents that it belongs to Andhra Bank. The fifth character (0) is reserved for future use. The last 6 characters (001807) represents that it belongs to Bidhannagar branch in district North 24 Parganas of West Bengal.
IFSC code (ANDB0001807) can be found on the front page of the account holder's passbook or in cheque leaf. You can also verify the same by contacting bank authority of Andhra Bank since data here could be outdated.
Bidhannagar branch of Andhra Bank is in West Bengal state of India.
CD-28, SECTOR - I, SALT LAKE, KOLKATA - 700064